In 1981, LEGO released 1 Duplo Building Sets sets, all of these sets have been retired.
Theme / Subtheme Duplo / Building Sets
Year 1981
Pieces / Duplo figures 22 / 2
Availability Retired
2350 LEGO Duplo Basic Building Set
Retail $14.99
Value $87.03
Growth  +480.6%
Annual growth 4.2%